Polar snake

local angle = -math.pi / 2
local yaw = 0
local speed = display.contentWidth / 48
local last = display.newCircle(display.contentCenterX, display.contentHeight * 0.975, display.contentWidth / 120)

local count = 5

Runtime:addEventListener('enterFrame',
    function(event)
        count = count - 1
        if count <= 0 then
            angle = angle + yaw
            count = count + 5
            local x, y = last.x + speed * math.cos(angle), last.y + speed * math.sin(angle)
            last = display.newCircle(x, y, display.contentWidth / 120)
        end
    end
)

Runtime:addEventListener('touch',
    function(event)
        if event.phase == 'began' or event.phase == 'moved' then
            yaw = math.pi / 30 * (event.x - display.contentCenterX) / display.contentCenterX
        else
            yaw = 0
        end
    end
)